<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        'use strict';
        let zcc={
            name:'zcc',
            birth:2000,
            age:function (){
                var now = new Date().getFullYear();
                return now-this.birth;
            }
        }
        var zcc1={
            name:'zcc',
            birth:2001,
        }
        console.log(zcc.age.apply(zcc1));
    </script>
</head>
<body>

</body>
</html>